User instructions to run the 5.6.0 Flatpak Beta:

Running the OpenCPN Flatpak beta requires a working Flatpak installation.

See https://flatpak.org/setup/ for platform-specific installation procedures.

Installing and running the beta is done from the command line. Installation:

$ flatpak install --user  https://flathub.org/beta-repo/appstream/org.opencpn.OpenCPN.flatpakref

Once installed, the beta version will be the default alternative and the one started when clicking on the OpenCPN desktop icon. However, if an earlier version was installed before the beta it is still available and can be started using

$ flatpak run org.opencpn.OpenCPN//stable

To start the beta from the command line:

$ flatpak run org.opencpn.OpenCPN//beta

To update the beta to latest version:

$ flatpak update org.opencpn.OpenCPN//beta

Also See Linux Devices